Asahi Kasei Kabushiki Kaisha

Asahi Kasei Chemicals Corporation

Toshinori Hirano

Hiroshi Nakayama

Yoshifumi Kado

Takuya Morikawa

Takuo Sawada

Akio Kashiwada

Yuichi Sakuma

[Problem to be Solved] A cation exchange membrane that has sufficient mechanical strength and at the same time has high impurity resistance, suffers little cathode surface damage, and exhibits stable electrolytic characteristics is provided. [Solution] A cation exchange membrane comprising:

Cation exchange membrane and electrolyzer

A cation-exchange membrane for electrolysis which comprises a fluoropolymer having ion-exchange groups and a porous base. It is characterized by having, on the anode-side surface of the membrane, protrusions comprising a polymer having ion-exchange groups. It is further characterized in that: when the average value of the heights of the tops of the protrusions from the anode-side surface of the membrane is expressed as h (&#x3bc;m), then 20&#x2266;h&#x2266;150; when the density of the protrusions distributed is expressed as P (protrusions per cm), then 50&#x2266;P&#x2266;1,200; when the average proportion of the areas of those bottom parts of the protrusions which are on the same level as the anode-side surface of the membrane to the area of the anode-side surface of the membrane is expressed as S (cm/cm), then 0.001&#x2266;S&#x2266;0.6; and when the average proportion of the areas of the top parts of the protrusions to the area of the anode-side surface of the membrane is expressed as T (cm/cm), then T&#x2266;0.05.

Cation-exchange fluorinated membrane for electrolysis and process for producing the same

A cation exchange membrane wherein a plain weave reinforced cloth is embedded in a fluorinated polymer having a sulfonic acid group and/or a carboxylic acid group, characterized by possessing therein a tubular path which is formed in a direction of a warp and a weft of the plain weave reinforced cloth and has a cross section flat to a direction of thickness of the membrane.

Reinforced cation exchange membrane and production process thereof

Growing community of inventors

Tokyo, Japan

Toshinori Hirano